Rainbow-electronics MAX8903A Manual do Utilizador descarregar pdf (Página 12)

MAX8903A

2A 1-Cell Li+ DC-DC Charger for USB*

and Adapter Power

12 ______________________________________________________________________________________

Circuit Description

The MAX8903A is a dual input charger with a 16V input

for a wide range of DC sources and USB inputs. The IC

includes a high-voltage (16V) input DC-DC step-down

converter that reduces charger power dissipation while

also supplying power to the system load. The step-

down converter supplies up to 2A to the system, the

battery, or a combination of both.

A USB charge input can charge the battery and power

the system from a USB power source. When powered

from USB or the DC input, system load current peaks

that exceed what can be supplied by the input are sup-

plemented by the battery.

The MAX8903A also manages load switching from the

battery to and from an external power source with an

on-chip 50mΩ MOSFET. This switch also helps support

load peaks using battery power when the input source

is overloaded.

BST

SYS

BAT

FLT

UOK

DOK

FAULT

OUTPUT

USB PWR OK

DC PWR OK

TO VL

4 x 100kΩ

17 USB

ISET

IDC

ISET

IDC

DCM

THM

CEN

IUSB

GND

NTC

10kΩ

USUS

CHARGE ON

OFF

100mA

500mA

USB SUSPEND

TO SYSTEM

LOAD

CHG

CHARGE

INDICATOR

4.7μF

0.15μF

ADAPTER

VBUS

GND

BST

0.1μF

1μH

USB

4.7μF

USB

10kΩ

TO VL

1-CELL

LI+

BAT

10μF

SYS

10μF

MAX8903A

Figure 2. Typical Application Circuit Using a Separate DC and USB Connector

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18 19 20

MAX8903A 1

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